Microemulsion-type washing liquid system for oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid and microemulsion technology, applied in the field of oil and gas well cementing, can solve the problems of poor interface cementation quality and low flushing efficiency, and achieve the effects of preventing emulsion blockage, improving flushing efficiency, and high solubilization ability.

Inactive Publication Date: 2016-11-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and shortcomings of existing cementing flushing fluids such as low flushing efficiency of oil-based drilling fluids and poor interface cementation quality. Based on the principle that microemulsions can spontaneously form when the oil phase in the base drilling fluid contacts, a microemulsion flushing fluid system and preparation method suitable for oil-based drilling fluids are proposed

Method used

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  • Microemulsion-type washing liquid system for oil-based drilling fluid and preparation method thereof
  • Microemulsion-type washing liquid system for oil-based drilling fluid and preparation method thereof
  • Microemulsion-type washing liquid system for oil-based drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0024] Embodiment 1: A kind of composition of microemulsion flushing fluid system suitable for oil-based drilling fluid

[0025] A microemulsion flushing fluid system suitable for oil-based drilling fluid consists of microemulsion flushing agent and base fluid. The microemulsion flushing agent can be composed of the following substances, and the mass parts of each substance are specifically: 100 parts of clear water, 4 parts of anionic surfactant bis(2-ethylhexyl) sulfosuccinate, 4 parts of nonionic surfactant iso 3 parts of tridecyl alcohol polyoxyethylene ether, 6 parts of co-surfactant n-butanol, and 7 parts of sodium chloride. The mass concentration of xanthan gum in the base liquid is 0.1%, the weighting agent barite mass concentration is 3%, and the flushing agent is added according to 15% of the mass fraction of the base liquid to prepare a microemulsion flushing liquid. Measure the interfacial tension between flushing fluid and oil with a spinning drop interfacial ten...

Embodiment 2

[0026] Embodiment 2: A kind of composition of microemulsion flushing fluid system suitable for oil-based drilling fluid

[0027] A microemulsion flushing fluid system suitable for oil-based drilling fluid consists of microemulsion flushing agent and base fluid. The microemulsion flushing agent can be composed of the following substances, and the mass parts of each substance are specifically: 100 parts of clear water, 6 parts of anionic surfactant bis(2-ethylhexyl) sulfosuccinate, 6 parts of nonionic surfactant iso 5 parts of tridecanol polyoxyethylene ether, 9 parts of co-surfactant n-butanol, and 10 parts of sodium chloride. The mass concentration of xanthan gum in the base liquid is 0.5%, the weighting agent quartz sand mass concentration is 25%, the washing liquid is added according to the mass fraction of 10% of the base liquid, the interfacial tension between the washing liquid and oil is measured, and its solubilization parameters for oil are calculated , Determination ...

Embodiment 3

[0031] Example 3: Evaluation of the wetting and inversion performance of the flushing solution system on the cemented surface

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Abstract

The invention discloses a microemulsion-type washing liquid system for an oil-based drilling fluid and a preparation method thereof. The microemulsion-type washing liquid system mainly solves the problem that the existing washing solution has low washing efficiency, a poor wetting reversion function and poor interface bonding quality. The washing liquid system comprises a microemulsion-type washing agent and a base liquid. The microemulsion-type washing agent comprises, by weight, 100 parts of clear water, 4-6 parts of an anionic surfactant, 3-6 parts of a nonionic surfactant, 6-10 parts of a cosurfactant and 7-15 parts of a salt. The base liquid is an aqueous solution containing a certain mass percentage concentration of a weighting agent and polymers. When the washing liquid contacts with an oil phase in the oil-based drilling fluid, a microemulsion can spontaneously form, can efficiently remove the residual oil-based drilling fluid, has a good wetting reversion capability, guarantees bonding of a cement sheath and an annulus interface and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of oil and gas well cementing, in particular to a microemulsion type flushing fluid system suitable for oil-based drilling fluid and a preparation method, especially suitable for flushing oil-based drilling fluid before cementing and improving the cementation quality of the cementing interface . Background technique [0002] Oil-based drilling fluid has stable performance, good lubricity, and strong inhibition, which is conducive to maintaining the stability of the wellbore. It is used in complex formations such as mud shale and salt-gypsum layers, and in special drilling operations such as deep wells and extended-reach wells. Since oil-based drilling fluid and cement slurry are two working fluids with different physical and chemical properties, if the oil-based drilling fluid on the well wall cannot be removed before cementing, the remaining oil-based drilling fluid on the well wall will be mixed into the cement In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/536
CPCC09K8/524C09K8/536
Inventor 王成文孟仁洲杨馥蔓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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